One-Dimensional Self-Assembled DNA Bundles on Superhydrohobic Surface (SHSs)

One-Dimensional Self-Assembled DNA Bundles on Superhydrohobic Surface (SHSs)

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Superhydrophobic surfaces (SHSs), fabricated by electron-beam lithography and inductively coupled plasma, are generally silicon micropillar array with a superhydrophobic coating. These surfaces have attracted much attention because of their superior properties of self-cleaning, anti-icing, rust protection, condensation control and energy conservation.

Recently, Gabriele Ciasca et al have tried to take advantage of superhydrophobic surfaces to realize self-assembled one-dimensional (1D) nanostructures. They mainly studied the effect of droplet evaporation dynamics on the size and spatial arrangement of self-assembled DNA bundles. Three specific spatial regions, encompassing three different arrangements of DNA bundles with different size distributions, were observed by scanning electron microscope.

The experimental results reveal that both the DNA bundle size and arrangement strongly rely on the droplet evaporation stage (from Cassie state to Wenzel state). In Cassie state, the minimum DNA filaments with ~20 nm wire diameter are obtained. Then the bundle size grows from few tens to few hundreds of nanometers when the evaporation proceeds. On the other hand, the scale of this region, where DNA bundles exist orderly, mainly depends on the initial DNA concentration. The region length is ~170 μm at high concentration of 150 ng μL-1 while ~40 μm at low concentration of 50 ng μL-1. This work has laid a significant foundation for illuminating the mechanism of 1D nanostructures on SHSs.

Original article citation

Gabriele Ciasca, Massimiliano Papi, Valentina Palmieri, Michela Chiarpotto, Simone Di Claudio, Adele De Ninno, Ennio Giovine, Gaetano Campi, Annamaria Gerardino, Luca Businaro, Marco De Spirito. “Controlling DNA Bundle Size and Spatial Arrangement in Self-assembled Arrays on Superhydrophobic Surface”, Nano-Micro Lett. 7(2), 146-151(2015). doi:10.1007/s40820-014-0027-z

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